topic Re: ContentServicePolicies.OnContentPropertyUpdatePolicy not raise event in Alfresco Archive

ContentServicePolicies.OnContentPropertyUpdatePolicy not raise event

colandr — Fri, 08 Feb 2013 09:39:02 GMT

Hello,I have created a new aspect which should execute function when metadata is modified. In the init method I have this.policyComponent.bindClassBehaviour( ContentServicePolicies.OnContentPropertyUpdatePolicy.QNAME, ASPECT_CONTENT_HITS, new

Re: ContentServicePolicies.OnContentPropertyUpdatePolicy not raise event

mitpatoliya — Fri, 08 Feb 2013 12:48:07 GMT

Refer the <b>CustomAspect</b> Example of Alfresco SDK.
You will get idea on how to create custom behaviors and associate them with policies.

Re: ContentServicePolicies.OnContentPropertyUpdatePolicy not raise event

colandr — Sat, 09 Feb 2013 15:41:00 GMT

I have already seen the CustomAspect of Alfresco SDK, it's ok to detect file modification and file creation, but still impossible to detect metadata modification. Moreover, it seems that my CustomAspect example of Alfresco SDK uses deprecated enumeration (

ContentServicePolicies.ON_CONTENT_READ‍

and

ContentServicePolicies.ON_CONTENT_UPDATE‍

) but it's no problem to replace them by

ContentServicePolicies.OnContentReadPolicy.QNAME‍

and

ContentServicePolicies.OnContentUpdatePolicy.QNAME‍

).

These 3 behaviours work properly
<java>
        // Register the policy behaviours
        this.policyComponent.bindClassBehaviour(
                                 QName.createQName(NamespaceService.ALFRESCO_URI, "onAddAspect"),
                                 ASPECT_CONTENT_HITS,
                                 new JavaBehaviour(this, "onAddAspect", NotificationFrequency.FIRST_EVENT));
        this.policyComponent.bindClassBehaviour(
                                 ContentServicePolicies.OnContentReadPolicy.QNAME,
                                 ASPECT_CONTENT_HITS,
                                 new JavaBehaviour(this, "onContentRead", NotificationFrequency.TRANSACTION_COMMIT));
        this.policyComponent.bindClassBehaviour(
                                 ContentServicePolicies.OnContentUpdatePolicy.QNAME,
                                 ASPECT_CONTENT_HITS,
                                 new JavaBehaviour(this, "onContentUpdate", NotificationFrequency.TRANSACTION_COMMIT));
</java>

but as I said in my first post, the fourth does not detect anything except if a file is modified:
<java>
        this.policyComponent.bindClassBehaviour(
             ContentServicePolicies.OnContentPropertyUpdatePolicy.QNAME,
             ASPECT_CONTENT_HITS,
             new JavaBehaviour(this, "onContentPropertyUpdate", NotificationFrequency.TRANSACTION_COMMIT));

</java>

And that is the function which should be called when metadata is modified
<java>
   public void onContentPropertyUpdate(NodeRef nodeRef,
                                            QName propertyQName,
                             ContentData beforeValue,
                                            ContentData afterValue) {
       System.out.println("Metadata Modified!! ");
       System.out.println("   on node        : " + nodeRef);
       System.out.println("   Propertie name : " + propertyQName.getLocalName());
       System.out.println("   old value      : " + beforeValue);
       System.out.println("   new value      : " + afterValue);
        }
</java>

All of my methods seems to be correct but maybe I have forgot something

Re: ContentServicePolicies.OnContentPropertyUpdatePolicy not raise event

afaust — Sun, 10 Feb 2013 14:51:59 GMT

Hello,

onContentPropertyUpdate is the wrong policy to implement in your specfici use case as I understand it. This policy will only be called if the actual file content changes and you will always end up with the

cm:content‍

property as the only property to reach your policy as long as you don't define specific types that have other content-related properties.
If you want your policy to be called when metadata changes, you need to use the onUpdateProperties policy callback from the NodeServicePolicies interface.

Regards
Axel

Re: ContentServicePolicies.OnContentPropertyUpdatePolicy not raise event

colandr — Sun, 10 Feb 2013 18:44:59 GMT

Thank you very much for your help AFaust.
It works fine now !